feat(ContractMobileTariffChangeWizard): create wizard to change mobile tariffs
CHANGELOG:
### Added
- [#939](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/939): Add wizard to change mobile tariffs by creating OTRS ChangeTariff Tickets.
Related card: https://trello.com/c/0hMF8ryc/1477-modificacions-al-wizard-canvi-tarifa-manual
Edited by Gerard Funosas